diff options
Diffstat (limited to 'drivers/staging/ath6kl/htc2/AR6000/ar6k_events.c')
| -rw-r--r-- | drivers/staging/ath6kl/htc2/AR6000/ar6k_events.c | 783 |
1 files changed, 0 insertions, 783 deletions
diff --git a/drivers/staging/ath6kl/htc2/AR6000/ar6k_events.c b/drivers/staging/ath6kl/htc2/AR6000/ar6k_events.c deleted file mode 100644 index d7af68f7056..00000000000 --- a/drivers/staging/ath6kl/htc2/AR6000/ar6k_events.c +++ /dev/null @@ -1,783 +0,0 @@ -//------------------------------------------------------------------------------ -// <copyright file="ar6k_events.c" company="Atheros"> -// Copyright (c) 2007-2010 Atheros Corporation. All rights reserved. -// -// -// Permission to use, copy, modify, and/or distribute this software for any -// purpose with or without fee is hereby granted, provided that the above -// copyright notice and this permission notice appear in all copies. -// -// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES -// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF -// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR -// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES -// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN -// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF -// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -// -// -//------------------------------------------------------------------------------ -//============================================================================== -// AR6K Driver layer event handling (i.e. interrupts, message polling) -// -// Author(s): ="Atheros" -//============================================================================== - -#include "a_config.h" -#include "athdefs.h" -#include "hw/mbox_host_reg.h" -#include "a_osapi.h" -#include "../htc_debug.h" -#include "hif.h" -#include "htc_packet.h" -#include "ar6k.h" - -extern void AR6KFreeIOPacket(struct ar6k_device *pDev, struct htc_packet *pPacket); -extern struct htc_packet *AR6KAllocIOPacket(struct ar6k_device *pDev); - -static int DevServiceDebugInterrupt(struct ar6k_device *pDev); - -#define DELAY_PER_INTERVAL_MS 10 /* 10 MS delay per polling interval */ - -/* completion routine for ALL HIF layer async I/O */ -int DevRWCompletionHandler(void *context, int status) -{ - struct htc_packet *pPacket = (struct htc_packet *)context; - - AR_DEBUG_PRINTF(ATH_DEBUG_RECV, - ("+DevRWCompletionHandler (Pkt:0x%lX) , Status: %d \n", - (unsigned long)pPacket, - status)); - - COMPLETE_HTC_PACKET(pPacket,status); - - AR_DEBUG_PRINTF(ATH_DEBUG_RECV, - ("-DevRWCompletionHandler\n")); - - return 0; -} - -/* mailbox recv message polling */ -int DevPollMboxMsgRecv(struct ar6k_device *pDev, - u32 *pLookAhead, - int TimeoutMS) -{ - int status = 0; - int timeout = TimeoutMS/DELAY_PER_INTERVAL_MS; - - A_ASSERT(timeout > 0); - - AR_DEBUG_PRINTF(ATH_DEBUG_RECV,("+DevPollMboxMsgRecv \n")); - - while (true) { - - if (pDev->GetPendingEventsFunc != NULL) { - - struct hif_pending_events_info events; - -#ifdef THREAD_X - events.Polling =1; -#endif - - /* the HIF layer uses a special mechanism to get events, do this - * synchronously */ - status = pDev->GetPendingEventsFunc(pDev->HIFDevice, - &events, - NULL); - if (status) - { - AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("Failed to get pending events \n")); - break; - } - - if (events.Events & HIF_RECV_MSG_AVAIL) - { - /* there is a message available, the lookahead should be valid now */ - *pLookAhead = events.LookAhead; - - break; - } - } else { - - /* this is the standard HIF way.... */ - /* load the register table */ - status = HIFReadWrite(pDev->HIFDevice, - HOST_INT_STATUS_ADDRESS, - (u8 *)&pDev->IrqProcRegisters, - AR6K_IRQ_PROC_REGS_SIZE, - HIF_RD_SYNC_BYTE_INC, - NULL); - - if (status){ - AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("Failed to read register table \n")); - break; - } - - /* check for MBOX data and valid lookahead */ - if (pDev->IrqProcRegisters.host_int_status & (1 << HTC_MAILBOX)) { - if (pDev->IrqProcRegisters.rx_lookahead_valid & (1 << HTC_MAILBOX)) - { - /* mailbox has a message and the look ahead is valid */ - *pLookAhead = pDev->IrqProcRegisters.rx_lookahead[HTC_MAILBOX]; - break; - } - } - - } - - timeout--; - - if (timeout <= 0) { - AR_DEBUG_PRINTF(ATH_DEBUG_ERR, (" Timeout waiting for recv message \n")); - status = A_ERROR; - - /* check if the target asserted */ - if ( pDev->IrqProcRegisters.counter_int_status & AR6K_TARGET_DEBUG_INTR_MASK) { - /* target signaled an assert, process this pending interrupt - * this will call the target failure handler */ - DevServiceDebugInterrupt(pDev); - } - - break; - } - - /* delay a little */ - A_MDELAY(DELAY_PER_INTERVAL_MS); - AR_DEBUG_PRINTF(ATH_DEBUG_RECV,(" Retry Mbox Poll : %d \n",timeout)); - } - - AR_DEBUG_PRINTF(ATH_DEBUG_RECV,("-DevPollMboxMsgRecv \n")); - - return status; -} - -static int DevServiceCPUInterrupt(struct ar6k_device *pDev) -{ - int status; - u8 cpu_int_status; - u8 regBuffer[4]; - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("CPU Interrupt\n")); - cpu_int_status = pDev->IrqProcRegisters.cpu_int_status & - pDev->IrqEnableRegisters.cpu_int_status_enable; - A_ASSERT(cpu_int_status); - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, - ("Valid interrupt source(s) in CPU_INT_STATUS: 0x%x\n", - cpu_int_status)); - - /* Clear the interrupt */ - pDev->IrqProcRegisters.cpu_int_status &= ~cpu_int_status; /* W1C */ - - /* set up the register transfer buffer to hit the register 4 times , this is done - * to make the access 4-byte aligned to mitigate issues with host bus interconnects that - * restrict bus transfer lengths to be a multiple of 4-bytes */ - - /* set W1C value to clear the interrupt, this hits the register first */ - regBuffer[0] = cpu_int_status; - /* the remaining 4 values are set to zero which have no-effect */ - regBuffer[1] = 0; - regBuffer[2] = 0; - regBuffer[3] = 0; - - status = HIFReadWrite(pDev->HIFDevice, - CPU_INT_STATUS_ADDRESS, - regBuffer, - 4, - HIF_WR_SYNC_BYTE_FIX, - NULL); - - A_ASSERT(status == 0); - return status; -} - - -static int DevServiceErrorInterrupt(struct ar6k_device *pDev) -{ - int status; - u8 error_int_status; - u8 regBuffer[4]; - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("Error Interrupt\n")); - error_int_status = pDev->IrqProcRegisters.error_int_status & 0x0F; - A_ASSERT(error_int_status); - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, - ("Valid interrupt source(s) in ERROR_INT_STATUS: 0x%x\n", - error_int_status)); - - if (ERROR_INT_STATUS_WAKEUP_GET(error_int_status)) { - /* Wakeup */ - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("Error : Wakeup\n")); - } - - if (ERROR_INT_STATUS_RX_UNDERFLOW_GET(error_int_status)) { - /* Rx Underflow */ - AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Error : Rx Underflow\n")); - } - - if (ERROR_INT_STATUS_TX_OVERFLOW_GET(error_int_status)) { - /* Tx Overflow */ - AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Error : Tx Overflow\n")); - } - - /* Clear the interrupt */ - pDev->IrqProcRegisters.error_int_status &= ~error_int_status; /* W1C */ - - /* set up the register transfer buffer to hit the register 4 times , this is done - * to make the access 4-byte aligned to mitigate issues with host bus interconnects that - * restrict bus transfer lengths to be a multiple of 4-bytes */ - - /* set W1C value to clear the interrupt, this hits the register first */ - regBuffer[0] = error_int_status; - /* the remaining 4 values are set to zero which have no-effect */ - regBuffer[1] = 0; - regBuffer[2] = 0; - regBuffer[3] = 0; - - status = HIFReadWrite(pDev->HIFDevice, - ERROR_INT_STATUS_ADDRESS, - regBuffer, - 4, - HIF_WR_SYNC_BYTE_FIX, - NULL); - - A_ASSERT(status == 0); - return status; -} - -static int DevServiceDebugInterrupt(struct ar6k_device *pDev) -{ - u32 dummy; - int status; - - /* Send a target failure event to the application */ - AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("Target debug interrupt\n")); - - if (pDev->TargetFailureCallback != NULL) { - pDev->TargetFailureCallback(pDev->HTCContext); - } - - if (pDev->GMboxEnabled) { - DevNotifyGMboxTargetFailure(pDev); - } - - /* clear the interrupt , the debug error interrupt is - * counter 0 */ - /* read counter to clear interrupt */ - status = HIFReadWrite(pDev->HIFDevice, - COUNT_DEC_ADDRESS, - (u8 *)&dummy, - 4, - HIF_RD_SYNC_BYTE_INC, - NULL); - - A_ASSERT(status == 0); - return status; -} - -static int DevServiceCounterInterrupt(struct ar6k_device *pDev) -{ - u8 counter_int_status; - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, ("Counter Interrupt\n")); - - counter_int_status = pDev->IrqProcRegisters.counter_int_status & - pDev->IrqEnableRegisters.counter_int_status_enable; - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, - ("Valid interrupt source(s) in COUNTER_INT_STATUS: 0x%x\n", - counter_int_status)); - - /* Check if the debug interrupt is pending - * NOTE: other modules like GMBOX may use the counter interrupt for - * credit flow control on other counters, we only need to check for the debug assertion - * counter interrupt */ - if (counter_int_status & AR6K_TARGET_DEBUG_INTR_MASK) { - return DevServiceDebugInterrupt(pDev); - } - - return 0; -} - -/* callback when our fetch to get interrupt status registers completes */ -static void DevGetEventAsyncHandler(void *Context, struct htc_packet *pPacket) -{ - struct ar6k_device *pDev = (struct ar6k_device *)Context; - u32 lookAhead = 0; - bool otherInts = false; - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("+DevGetEventAsyncHandler: (dev: 0x%lX)\n", (unsigned long)pDev)); - - do { - - if (pPacket->Status) { - AR_DEBUG_PRINTF(ATH_DEBUG_ERR, - (" GetEvents I/O request failed, status:%d \n", pPacket->Status)); - /* bail out, don't unmask HIF interrupt */ - break; - } - - if (pDev->GetPendingEventsFunc != NULL) { - /* the HIF layer collected the information for us */ - struct hif_pending_events_info *pEvents = (struct hif_pending_events_info *)pPacket->pBuffer; - if (pEvents->Events & HIF_RECV_MSG_AVAIL) { - lookAhead = pEvents->LookAhead; - if (0 == lookAhead) { - AR_DEBUG_PRINTF(ATH_DEBUG_ERR,(" DevGetEventAsyncHandler1, lookAhead is zero! \n")); - } - } - if (pEvents->Events & HIF_OTHER_EVENTS) { - otherInts = true; - } - } else { - /* standard interrupt table handling.... */ - struct ar6k_irq_proc_registers *pReg = (struct ar6k_irq_proc_registers *)pPacket->pBuffer; - u8 host_int_status; - - host_int_status = pReg->host_int_status & pDev->IrqEnableRegisters.int_status_enable; - - if (host_int_status & (1 << HTC_MAILBOX)) { - host_int_status &= ~(1 << HTC_MAILBOX); - if (pReg->rx_lookahead_valid & (1 << HTC_MAILBOX)) { - /* mailbox has a message and the look ahead is valid */ - lookAhead = pReg->rx_lookahead[HTC_MAILBOX]; - if (0 == lookAhead) { - AR_DEBUG_PRINTF(ATH_DEBUG_ERR,(" DevGetEventAsyncHandler2, lookAhead is zero! \n")); - } - } - } - - if (host_int_status) { - /* there are other interrupts to handle */ - otherInts = true; - } - } - - if (otherInts || (lookAhead == 0)) { - /* if there are other interrupts to process, we cannot do this in the async handler so - * ack the interrupt which will cause our sync handler to run again - * if however there are no more messages, we can now ack the interrupt */ - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, - (" Acking interrupt from DevGetEventAsyncHandler (otherints:%d, lookahead:0x%X)\n", - otherInts, lookAhead)); - HIFAckInterrupt(pDev->HIFDevice); - } else { - int fetched = 0; - int status; - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, - (" DevGetEventAsyncHandler : detected another message, lookahead :0x%X \n", - lookAhead)); - /* lookahead is non-zero and there are no other interrupts to service, - * go get the next message */ - status = pDev->MessagePendingCallback(pDev->HTCContext, &lookAhead, 1, NULL, &fetched); - - if (!status && !fetched) { - /* HTC layer could not pull out messages due to lack of resources, stop IRQ processing */ - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("MessagePendingCallback did not pull any messages, force-ack \n")); - DevAsyncIrqProcessComplete(pDev); - } - } - - } while (false); - - /* free this IO packet */ - AR6KFreeIOPacket(pDev,pPacket); - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("-DevGetEventAsyncHandler \n")); -} - -/* called by the HTC layer when it wants us to check if the device has any more pending - * recv messages, this starts off a series of async requests to read interrupt registers */ -int DevCheckPendingRecvMsgsAsync(void *context) -{ - struct ar6k_device *pDev = (struct ar6k_device *)context; - int status = 0; - struct htc_packet *pIOPacket; - - /* this is called in an ASYNC only context, we may NOT block, sleep or call any apis that can - * cause us to switch contexts */ - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("+DevCheckPendingRecvMsgsAsync: (dev: 0x%lX)\n", (unsigned long)pDev)); - - do { - - if (HIF_DEVICE_IRQ_SYNC_ONLY == pDev->HifIRQProcessingMode) { - /* break the async processing chain right here, no need to continue. - * The DevDsrHandler() will handle things in a loop when things are driven - * synchronously */ - break; - } - - /* an optimization to bypass reading the IRQ status registers unecessarily which can re-wake - * the target, if upper layers determine that we are in a low-throughput mode, we can - * rely on taking another interrupt rather than re-checking the status registers which can - * re-wake the target */ - if (pDev->RecheckIRQStatusCnt == 0) { - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("Bypassing IRQ Status re-check, re-acking HIF interrupts\n")); - /* ack interrupt */ - HIFAckInterrupt(pDev->HIFDevice); - break; - } - - /* first allocate one of our HTC packets we created for async I/O - * we reuse HTC packet definitions so that we can use the completion mechanism - * in DevRWCompletionHandler() */ - pIOPacket = AR6KAllocIOPacket(pDev); - - if (NULL == pIOPacket) { - /* there should be only 1 asynchronous request out at a time to read these registers - * so this should actually never happen */ - status = A_NO_MEMORY; - A_ASSERT(false); - break; - } - - /* stick in our completion routine when the I/O operation completes */ - pIOPacket->Completion = DevGetEventAsyncHandler; - pIOPacket->pContext = pDev; - - if (pDev->GetPendingEventsFunc) { - /* HIF layer has it's own mechanism, pass the IO to it.. */ - status = pDev->GetPendingEventsFunc(pDev->HIFDevice, - (struct hif_pending_events_info *)pIOPacket->pBuffer, - pIOPacket); - - } else { - /* standard way, read the interrupt register table asynchronously again */ - status = HIFReadWrite(pDev->HIFDevice, - HOST_INT_STATUS_ADDRESS, - pIOPacket->pBuffer, - AR6K_IRQ_PROC_REGS_SIZE, - HIF_RD_ASYNC_BYTE_INC, - pIOPacket); - } - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,(" Async IO issued to get interrupt status...\n")); - } while (false); - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("-DevCheckPendingRecvMsgsAsync \n")); - - return status; -} - -void DevAsyncIrqProcessComplete(struct ar6k_device *pDev) -{ - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("DevAsyncIrqProcessComplete - forcing HIF IRQ ACK \n")); - HIFAckInterrupt(pDev->HIFDevice); -} - -/* process pending interrupts synchronously */ -static int ProcessPendingIRQs(struct ar6k_device *pDev, bool *pDone, bool *pASyncProcessing) -{ - int status = 0; - u8 host_int_status = 0; - u32 lookAhead = 0; - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("+ProcessPendingIRQs: (dev: 0x%lX)\n", (unsigned long)pDev)); - - /*** NOTE: the HIF implementation guarantees that the context of this call allows - * us to perform SYNCHRONOUS I/O, that is we can block, sleep or call any API that - * can block or switch thread/task ontexts. - * This is a fully schedulable context. - * */ - do { - - if (pDev->IrqEnableRegisters.int_status_enable == 0) { - /* interrupt enables have been cleared, do not try to process any pending interrupts that - * may result in more bus transactions. The target may be unresponsive at this - * point. */ - break; - } - - if (pDev->GetPendingEventsFunc != NULL) { - struct hif_pending_events_info events; - -#ifdef THREAD_X - events.Polling= 0; -#endif - /* the HIF layer uses a special mechanism to get events - * get this synchronously */ - status = pDev->GetPendingEventsFunc(pDev->HIFDevice, - &events, - NULL); - - if (status) { - break; - } - - if (events.Events & HIF_RECV_MSG_AVAIL) { - lookAhead = events.LookAhead; - if (0 == lookAhead) { - AR_DEBUG_PRINTF(ATH_DEBUG_ERR,(" ProcessPendingIRQs1 lookAhead is zero! \n")); - } - } - - if (!(events.Events & HIF_OTHER_EVENTS) || - !(pDev->IrqEnableRegisters.int_status_enable & OTHER_INTS_ENABLED)) { - /* no need to read the register table, no other interesting interrupts. - * Some interfaces (like SPI) can shadow interrupt sources without - * requiring the host to do a full table read */ - break; - } - - /* otherwise fall through and read the register table */ - } - - /* - * Read the first 28 bytes of the HTC register table. This will yield us - * the value of different int status registers and the lookahead - * registers. - * length = sizeof(int_status) + sizeof(cpu_int_status) + - * sizeof(error_int_status) + sizeof(counter_int_status) + - * sizeof(mbox_frame) + sizeof(rx_lookahead_valid) + - * sizeof(hole) + sizeof(rx_lookahead) + - * sizeof(int_status_enable) + sizeof(cpu_int_status_enable) + - * sizeof(error_status_enable) + - * sizeof(counter_int_status_enable); - * - */ -#ifdef CONFIG_MMC_SDHCI_S3C - pDev->IrqProcRegisters.host_int_status = 0; - pDev->IrqProcRegisters.rx_lookahead_valid = 0; - pDev->IrqProcRegisters.host_int_status2 = 0; - pDev->IrqProcRegisters.rx_lookahead[0] = 0; - pDev->IrqProcRegisters.rx_lookahead[1] = 0xaaa5555; -#endif /* CONFIG_MMC_SDHCI_S3C */ - status = HIFReadWrite(pDev->HIFDevice, - HOST_INT_STATUS_ADDRESS, - (u8 *)&pDev->IrqProcRegisters, - AR6K_IRQ_PROC_REGS_SIZE, - HIF_RD_SYNC_BYTE_INC, - NULL); - - if (status) { - break; - } - -#ifdef ATH_DEBUG_MODULE - if (AR_DEBUG_LVL_CHECK(ATH_DEBUG_IRQ)) { - DevDumpRegisters(pDev, - &pDev->IrqProcRegisters, - &pDev->IrqEnableRegisters); - } -#endif - - /* Update only those registers that are enabled */ - host_int_status = pDev->IrqProcRegisters.host_int_status & - pDev->IrqEnableRegisters.int_status_enable; - - if (NULL == pDev->GetPendingEventsFunc) { - /* only look at mailbox status if the HIF layer did not provide this function, - * on some HIF interfaces reading the RX lookahead is not valid to do */ - if (host_int_status & (1 << HTC_MAILBOX)) { - /* mask out pending mailbox value, we use "lookAhead" as the real flag for - * mailbox processing below */ - host_int_status &= ~(1 << HTC_MAILBOX); - if (pDev->IrqProcRegisters.rx_lookahead_valid & (1 << HTC_MAILBOX)) { - /* mailbox has a message and the look ahead is valid */ - lookAhead = pDev->IrqProcRegisters.rx_lookahead[HTC_MAILBOX]; - if (0 == lookAhead) { - AR_DEBUG_PRINTF(ATH_DEBUG_ERR,(" ProcessPendingIRQs2, lookAhead is zero! \n")); - } - } - } - } else { - /* not valid to check if the HIF has another mechanism for reading mailbox pending status*/ - host_int_status &= ~(1 << HTC_MAILBOX); - } - - if (pDev->GMboxEnabled) { - /*call GMBOX layer to process any interrupts of interest */ - status = DevCheckGMboxInterrupts(pDev); - } - - } while (false); - - - do { - - /* did the interrupt status fetches succeed? */ - if (status) { - break; - } - - if ((0 == host_int_status) && (0 == lookAhead)) { - /* nothing to process, the caller can use this to break out of a loop */ - *pDone = true; - break; - } - - if (lookAhead != 0) { - int fetched = 0; - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("Pending mailbox message, LookAhead: 0x%X\n",lookAhead)); - /* Mailbox Interrupt, the HTC layer may issue async requests to empty the - * mailbox... - * When emptying the recv mailbox we use the async handler above called from the - * completion routine of the callers read request. This can improve performance - * by reducing context switching when we rapidly pull packets */ - status = pDev->MessagePendingCallback(pDev->HTCContext, &lookAhead, 1, pASyncProcessing, &fetched); - if (status) { - break; - } - - if (!fetched) { - /* HTC could not pull any messages out due to lack of resources */ - /* force DSR handler to ack the interrupt */ - *pASyncProcessing = false; - pDev->RecheckIRQStatusCnt = 0; - } - } - - /* now handle the rest of them */ - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ, - (" Valid interrupt source(s) for OTHER interrupts: 0x%x\n", - host_int_status)); - - if (HOST_INT_STATUS_CPU_GET(host_int_status)) { - /* CPU Interrupt */ - status = DevServiceCPUInterrupt(pDev); - if (status){ - break; - } - } - - if (HOST_INT_STATUS_ERROR_GET(host_int_status)) { - /* Error Interrupt */ - status = DevServiceErrorInterrupt(pDev); - if (status){ - break; - } - } - - if (HOST_INT_STATUS_COUNTER_GET(host_int_status)) { - /* Counter Interrupt */ - status = DevServiceCounterInterrupt(pDev); - if (status){ - break; - } - } - - } while (false); - - /* an optimization to bypass reading the IRQ status registers unecessarily which can re-wake - * the target, if upper layers determine that we are in a low-throughput mode, we can - * rely on taking another interrupt rather than re-checking the status registers which can - * re-wake the target. - * - * NOTE : for host interfaces that use the special GetPendingEventsFunc, this optimization cannot - * be used due to possible side-effects. For example, SPI requires the host to drain all - * messages from the mailbox before exiting the ISR routine. */ - if (!(*pASyncProcessing) && (pDev->RecheckIRQStatusCnt == 0) && (pDev->GetPendingEventsFunc == NULL)) { - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("Bypassing IRQ Status re-check, forcing done \n")); - *pDone = true; - } - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("-ProcessPendingIRQs: (done:%d, async:%d) status=%d \n", - *pDone, *pASyncProcessing, status)); - - return status; -} - - -/* Synchronousinterrupt handler, this handler kicks off all interrupt processing.*/ -int DevDsrHandler(void *context) -{ - struct ar6k_device *pDev = (struct ar6k_device *)context; - int status = 0; - bool done = false; - bool asyncProc = false; - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("+DevDsrHandler: (dev: 0x%lX)\n", (unsigned long)pDev)); - - /* reset the recv counter that tracks when we need to yield from the DSR */ - pDev->CurrentDSRRecvCount = 0; - /* reset counter used to flag a re-scan of IRQ status registers on the target */ - pDev->RecheckIRQStatusCnt = 0; - - while (!done) { - status = ProcessPendingIRQs(pDev, &done, &asyncProc); - if (status) { - break; - } - - if (HIF_DEVICE_IRQ_SYNC_ONLY == pDev->HifIRQProcessingMode) { - /* the HIF layer does not allow async IRQ processing, override the asyncProc flag */ - asyncProc = false; - /* this will cause us to re-enter ProcessPendingIRQ() and re-read interrupt status registers. - * this has a nice side effect of blocking us until all async read requests are completed. - * This behavior is required on some HIF implementations that do not allow ASYNC - * processing in interrupt handlers (like Windows CE) */ - - if (pDev->DSRCanYield && DEV_CHECK_RECV_YIELD(pDev)) { - /* ProcessPendingIRQs() pulled enough recv messages to satisfy the yield count, stop - * checking for more messages and return */ - break; - } - } - - if (asyncProc) { - /* the function performed some async I/O for performance, we - need to exit the ISR immediately, the check below will prevent the interrupt from being - Ack'd while we handle it asynchronously */ - break; - } - - } - - if (!status && !asyncProc) { - /* Ack the interrupt only if : - * 1. we did not get any errors in processing interrupts - * 2. there are no outstanding async processing requests */ - if (pDev->DSRCanYield) { - /* if the DSR can yield do not ACK the interrupt, there could be more pending messages. - * The HIF layer must ACK the interrupt on behalf of HTC */ - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,(" Yield in effect (cur RX count: %d) \n", pDev->CurrentDSRRecvCount)); - } else { - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,(" Acking interrupt from DevDsrHandler \n")); - HIFAckInterrupt(pDev->HIFDevice); - } - } - - AR_DEBUG_PRINTF(ATH_DEBUG_IRQ,("-DevDsrHandler \n")); - return status; -} - -#ifdef ATH_DEBUG_MODULE -void DumpAR6KDevState(struct ar6k_device *pDev) -{ - int status; - struct ar6k_irq_enable_registers regs; - struct ar6k_irq_proc_registers procRegs; - - LOCK_AR6K(pDev); - /* copy into our temp area */ - memcpy(®s,&pDev->IrqEnableRegisters,AR6K_IRQ_ENABLE_REGS_SIZE); - UNLOCK_AR6K(pDev); - - /* load the register table from the device */ - status = HIFReadWrite(pDev->HIFDevice, - HOST_INT_STATUS_ADDRESS, - (u8 *)&procRegs, - AR6K_IRQ_PROC_REGS_SIZE, - HIF_RD_SYNC_BYTE_INC, - NULL); - - if (status) { - AR_DEBUG_PRINTF(ATH_DEBUG_ERR, - ("DumpAR6KDevState : Failed to read register table (%d) \n",status)); - return; - } - - DevDumpRegisters(pDev,&procRegs,®s); - - if (pDev->GMboxInfo.pStateDumpCallback != NULL) { - pDev->GMboxInfo.pStateDumpCallback(pDev->GMboxInfo.pProtocolContext); - } - - /* dump any bus state at the HIF layer */ - HIFConfigureDevice(pDev->HIFDevice,HIF_DEVICE_DEBUG_BUS_STATE,NULL,0); - -} -#endif - - |